Explosive cartridge



June 21, 932. D. B. MccLouD EXPLOSIVE CARTRIDGE Filed March 2l, 1931 2Sheets-Sheet June 21, 1932. D. BY MCCLOUD EXPLOSIVE CARTRIDGE FiledMarch 2l, 1931 2 Sheets-Sheet atented .lune la?? "193i non is. iaccnoun,or :ooe-uom, ILLINOIS i EXPLOSIVE .a 'BRIDGE Application filed March 21,1931. Serial No. 524,235.

rlhis invention relates to an explosive cartridge, and particularly acartridge for .explosive purposes in open pit miningand quarryingrforblasting and loosening surface r rock and earth. An explosive cartridgeof the type of the present invention comprises an outer cloth or canvascovering or container filled with' a carbonaceous material such as soot,sawdust, or the like. The outer cloth covering or bag is preferablyclosed at one end, and after filling with the carbonaceous material,.the open end is tied with metal tie wire, and the cartridge thensaturated with M liquid oxygen, making a highly explosive acter isimmersed' in the liquid oxygen for saturatiom'it readily absorbs severaltimes its' original weight of the liquid.-

In 'openpit mining operations the blast 20' holes are drilledvertically, and are from four to eight inches in diameter. Water is`used in the process of drilling, and at the time of loading ordepositing cartridges in i the blastholes, the walls of the holes are 25often wet'fr'm top tobottom. In loading a hole with liquidoxygenexplosive cartridges, the firstcartridge is usually .lowered ordropped to thebottom of the hole,.the next1 cartridge is then dropped ontop of theV first,

ber' have beenY deposited in the hole, after. which dirt stemming orfilling is placed on ,top of the charge. A- fulminate cap is inysertedin one of the lcartridges during the loading operationV for laterdetonation., t is desirable to have the cartridges of as large diameteras possible so as to obtain the maximum amount of explosive inthelimited load;- ing space afforded in the lower portion of the drillhole. It is also necessary to load liquid oxygen explosive very quicklybecause when exposed' to ordinary temperatures, the liquid oxygenevaporatesrapidly, causing deterioration of the cartridge. I

45 v An explosivecartridge consisting ofa cloth bag ofthe proper sizeand shape filled with carbonaceous material has been unsatisfac` tory.and has been the causeof premature eX- plosion's. 'Such cartridges whensaturated 5,9 with nquidpxygn become soa-,.eabby, amr

cartridge. When a cartridge of this char-V and this is continued untilthe required num-` misshapen. When lowered or dropped down the drillhole, they frequently lodge before i reaching the bottom by contact witha slight projection that may exist in the hole, or by reason of theilabby condition of the cartridge. Upon lodging, the cartridge willfreeze tightly to` the wet wall of the hole inasmuch as the temperatureof the saturated cartridge is approximately 184 degrees below zeroCentigrade, this being the temperature of the liquid oxygen, and thecartridge must then be removed or forced down quickly into the hole.This is a hazardous undertaking, and loss of life has occurred byrodding lodged cartridges in efforts to isengage them. An object is toprovide a cartridge of the character stated, having the property ofbeing maintainedqafter saturation in true cylindrical form to facilitatehandling and to avoid lodging, and ffwhich is economical to manufactureand highly eficientfor the purose. v p Other objects will appearhereinafter.

The invention consists in the combinations and arrangements of partshereinafter described and claimed. l

The invention will be best understood by reference to the accompanyingdrawings forming a part of this specification, and in which: n

Fig. 1 is a perspective view of the coinpletedexplosive cartridge of thepresent 1nvention; j

Fig. 2is a longitudinal sectional view taken substantially on the line2-2 of Fig. 1;

Fig. 3 isa sectionalw'iew similar to Flg. 2, `with the carbonaceousmaterial omitted;

Fig. 4 is ,fa transverse sectional view taken substantially .on the line4 4 of Fig. 2; and

Fig. 5 is ak face view of the perforated lining material employed.

`As illustrated inthe drawings, the prey ferred embodiment of theinvention comprises an outer cloth container which is pref erablycomposed of strong heavy cloth, woven so as to be sufficiently porous toallow saturationn` with liquid oxygen. As shown, this outer container orbag is sewed 1n such manner Athat when filled. or packed, the

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cartridge will assume a cylindrical shape. 'llhe closed end 8is'preferably conical to facilitate deposit in a blasthole, and afterfilling, the open end is gathered and tied with tie wires 9, leaving aloose pro] ecting portion l() which is grasped in handling.

A particular feature of the present invention is the employment of alining material 11 which is preferably bent into cylindrical form andinsertedwithin the outer cloth bagL material be sufficiently flexible topermit ofl bending into cylindrical form. y

In general use, strawboard of .025 caliper has proved very satisfactory.ln making the liner,`strawboard is cut into a ysheet having a lengthequal to the length ofthe cylindrical portion of the cartridge whenfilled, and al width approximately two inches greater than thecircumference .of the lled cartridge.

' The invention is especially adapted for use 1n cartridges ranging fromthree lto seven and one-half inches in diameter, and prior to insertionof the lining'material, it is perforated with a plurality of holes oropenings.A

Straw/board or equivalent material having the stiffness and rigiditystated is not sufliciently porous, and wouldtherefore obstructsaturation with liquid oxygen. To allow for such saturation, the liningmaterial is provided with af'plurality of perforations or openings 12."These openings or perforations may be round, as shown, square, or anyde sired shape, and are preferably disposed approximately two inchesapart when providf ing round openings each'three-eighths of an inchindiameter. Smaller openings may be provided with relatively closerspacing when employing a thin cardboard, for example, to avoid weakeningthe-liner sothat it might rumple or break in service. 1

Consequently, the dimensions given may be varied while usingapproximately the same proportion between the spacing and the size ofthe openings. If the perforations are too large, the carbonaceousmaterial of the cartridge may bulge" or extrude through the vopenings,if the/cartridge is tightly'packed,

which would tend to defeat the ,purpose of making a smooth, rigidcartridge to avoid lodging in-a drill hole. Rapidity and lapping theliningmaterial when cylindricaleconomy in manufacture is attained byoverreeaeai ly formed and inserted in the cloth container, as shown at13 in `Fig. 4.

By interposing a lining material of the character stated, which isrelatively sti yet sufficiently flexible to be bent into cylindricalshape,.between the outer cloth container and the carbonaceous filler,therey is provided a cartridge that is smooth', rigid, and formed`r tohold a true cylindrical shape after satura- Wil' details of constructionasset forth, but`desire to avail myself of such variations andmodifications as come within the scope of the appended claims.

What l claim as new and desire to secure by Letters Patent is:

described, adapted to be saturated with liquid ,I

oxygen, comprising an outer cloth container sewed in such manner as toassumea cylindrical shape when filled yor packed, a fillerofcarbonaceous material, and a lining material interposed between saidcontainerl and said filler, said lining material composed of chipboard,y strawboard, pulpboard, cardboard, jut'eboard, pressboard, or the likerelatively sti in structure, but of sufficient flexibility to bebent-into cylindrical formation for insertion in said container, andalso provided with a plurality of perforations for rapid saturation ofsaid filler, said perforations being substantially in the proportion ofa two inch spacing between perforations, each of apprximatelythree-eighths inch diameter.

oxygen, comprising an outer cloth container sewed in such manner as toassume a cylin-` n explosive cartridge of the character described,adapted to be saturated with liquid izo 3. An explosive cartridge oftheicharacter jdescribed, adapted to be saturated with liquid oxygen,comprising an outer cloth contalner sewed in such manner as to assume acylindricalshape when filled or packed, afilller of carbonaceousmaterial, and a lining material interposed between said container andsaid filler, said lining material composed of straw-- board ofsubstantially twenty-ve-thou sandths caliper, and provided with aplurality of spaced perforations for rapid saturation of said filler,said perforations being substantially in the proportion of a two inchspacing between perforations, each of approximately three-eighths inchdiameter.

4. A lining material for an explosive cartridge of the characterdescribed, comprising a sheet of strawboard, of substantiallytwenty-ive-thousandths caliper, and provided with a plurality of spacedperforations substantially in the proportion of a two inch space betweenperforations` each of approximately three-eighths inch diameter.

5. An explosive cartridge of the character described, adapted to besaturated with liquid oxygen, comprising an outer cloth container sewedin such manner as to assume a cylindrical shape when iilled or packed, afiller of carbonaceous material, and a lining material interposedbetween said container and said filler. said lining material composed ofchipboard, pulpboard, cardboard, juteboard, pressboardstrawboard, or thelike, of suficient exibility to be bent for insertion in said container,and also provided with a plurality of perforations for rapid saturationof said filler.

6. An explosive cartridge of the character described, adapted to besaturated with liquid oxygen. comprising an outer cloth container sewedin such manner as to assume a cylinn drical shape when filled or packed,a ller of carbnaceous material, and a lining material interposed betweensaid container and said ller, said lining material composed ofchipboard, pulpboard, cardboard, juteboard` pressboard, strawboard, orthe like, relatively still in structure, but of suiiicient flexibilityto be bent into cylindrical formation for insertion in said container,and also provided with a plurality of perforations for rapid saturationof said filler.

In testimony whereof I have signed my name to this specication.

DON B. MOCLOUD.

